const arr= [1,2,3]

let arr1= [...arr];


arr1.push(4);


console.log(arr)  //[1,2,3]

console.log(arr1) //[1,2,3,4]

console.log(arr==arr1)  //false;

console.log(arr===arr1) //false;



print name  letter after 1 second

code splitting
difference between class-based components and functional component
controlled uncontrolled component
error boundary in case of class and functional component
debouncing and throttling
optimising a react app



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